Run of lintian-fixes for rust-grep-regex

Try this locally (using the package):

debcheckout rust-grep-regex
cd rust-grep-regex
DEB_UPDATE_CHANGELOG=auto lintian-brush
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test result: ok. 19 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out

autopkgtest [22:35:22]: test librust-grep-regex-dev:: -----------------------]
autopkgtest [22:35:23]: test librust-grep-regex-dev::  - - - - - - - - - - results - - - - - - - - - -
librust-grep-regex-dev: PASS
autopkgtest [22:35:32]: @@@@@@@@@@@@@@@@@@@@ summary
rust-grep-regex:@    PASS
librust-grep-regex-dev:default PASS
librust-grep-regex-dev: PASS
Unexpected error:
Traceback (most recent call last):
  File "/usr/share/autopkgtest/lib/VirtSubproc.py", line 739, in mainloop
    command()
  File "/usr/share/autopkgtest/lib/VirtSubproc.py", line 668, in command

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